Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Darts Checkout Calculator
Do you struggle trying to remember the checkouts for various numbers in darts? I know I do
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.7
6 ratings · Below Average
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Darts Checkout Calculator: map the core Sports workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Enhance with additional game modes and statistics tracking.
Assumption to check: Limited features and functionality
Validate with people who use this workflow before building.
Hypothesis 2
Focus on improving user experience and addressing common complaints.
Assumption to check: Poor user reviews and ratings
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize settings and themes.
Assumption to check: Lack of customization options
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a guided tutorial for new users.
Assumption to check: Minimal onboarding experience
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Do you struggle trying to remember the checkouts for various numbers in darts? I know I do. What are the various checkouts that are possible? When are there no checkouts possible. It is all made more difficult when you only have one or two darts left. Is there a checkout and you just cannot see it. Some are very obscure. There are literally tens of thousands of combinations for the checkout from 170 down to 2. This App aims to solve these problems for you. It has a comprehensive list of all of the possible checkouts for each starting value given the number of darts involved. It will show you what checkouts are possible and when there are no checkouts possible. All you have to do is provide the starting value, say 170, and then each value scored. The starting value is adjusted for each dart entered. When you score reaches the point where outs are possible then the table starts showing you all possible outs. As you enter dart values the list of outs will change. First enter your starting value in the green field at the top of the screen. The keyboard will be shown and you can enter any value you want. If there are outs for that value then they will be shown in the table. At the top of the table it will inform you of the number of outs that there are. At the bottom of the screen are three fields that are used to enter the values for the three darts. Select the appropriate field and using the keyboard enter the value scored. So, if you hit treble 17 then enter 51. This value will be subtracted from the score at the top and the outs table will be updated to reflect the new possible outs. If you enter the value for the first dart then the table will change to show all possible outs for the new value using 2 darts. If you enter the value for the second dart then the table will change to show all possible outs for the new value using 1 dart. When you enter the third dart's value the score is updated and the table is changed to show all possible outs using three darts. The values for the darts are reset back to zero so that you can score another set of three darts. As you enter dart information the background for that dart changes to green to show it has been entered. Don't forget to enter zero for a dart if that is what was scored.
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Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
React Navigation
@react-native-community/async-storage
react-native-gesture-handler
expo-sound
BUILD KIT DIFFICULTY
Intermediate
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
